diff --git a/build.gradle b/build.gradle
index aa293631..ea4367b7 100644
--- a/build.gradle
+++ b/build.gradle
@@ -59,6 +59,7 @@ dependencies {
     implementation 'org.springdoc:springdoc-openapi-ui:1.6.11'
     implementation 'org.liquibase:liquibase-core'
     implementation 'com.vladmihalcea:hibernate-types-55:2.19.2'
+    implementation 'com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.13.4'
     implementation 'org.openapitools:jackson-databind-nullable:0.2.3'
     implementation 'org.modelmapper:modelmapper:3.1.0'
     implementation 'org.iban4j:iban4j:3.2.3-RELEASE'
diff --git a/src/main/java/net/hostsharing/hsadminng/config/JsonObjectMapperConfiguration.java b/src/main/java/net/hostsharing/hsadminng/config/JsonObjectMapperConfiguration.java
index 087b76f2..8c6cb2b3 100644
--- a/src/main/java/net/hostsharing/hsadminng/config/JsonObjectMapperConfiguration.java
+++ b/src/main/java/net/hostsharing/hsadminng/config/JsonObjectMapperConfiguration.java
@@ -1,5 +1,6 @@
 package net.hostsharing.hsadminng.config;
 
+import com.fasterxml.jackson.databind.SerializationFeature;
 import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
 import org.openapitools.jackson.nullable.JsonNullableModule;
 import org.springframework.context.annotation.Bean;
@@ -14,6 +15,7 @@ public class JsonObjectMapperConfiguration {
     @Primary
     public Jackson2ObjectMapperBuilder customObjectMapper() {
         return new Jackson2ObjectMapperBuilder()
-            .modules(new JsonNullableModule(), new JavaTimeModule());
+                .modules(new JsonNullableModule(), new JavaTimeModule())
+                .featuresToDisable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
     }
 }
diff --git a/src/main/resources/db/changelog/228-hs-office-partner-test-data.sql b/src/main/resources/db/changelog/228-hs-office-partner-test-data.sql
index 7e4f5505..45928bfd 100644
--- a/src/main/resources/db/changelog/228-hs-office-partner-test-data.sql
+++ b/src/main/resources/db/changelog/228-hs-office-partner-test-data.sql
@@ -8,28 +8,37 @@
 /*
     Creates a single partner test record.
  */
-create or replace procedure createHsOfficePartnerTestData( personTradeName varchar, contactLabel varchar )
+create or replace procedure createHsOfficePartnerTestData( personTradeOrFamilyName varchar, contactLabel varchar )
     language plpgsql as $$
 declare
     currentTask     varchar;
     idName          varchar;
     relatedPerson   hs_office_person;
     relatedContact  hs_office_contact;
+    birthday        date;
 begin
-    idName := cleanIdentifier( personTradeName|| '-' || contactLabel);
+    idName := cleanIdentifier( personTradeOrFamilyName|| '-' || contactLabel);
     currentTask := 'creating partner test-data ' || idName;
     call defineContext(currentTask, null, 'superuser-alex@hostsharing.net', 'global#global.admin');
     execute format('set local hsadminng.currentTask to %L', currentTask);
 
-    select p.* from hs_office_person p where p.tradeName = personTradeName into relatedPerson;
-    select c.* from hs_office_contact c where c.label = contactLabel into relatedContact;
+    select p.* from hs_office_person p
+               where p.tradeName = personTradeOrFamilyName or p.familyName = personTradeOrFamilyName
+               into relatedPerson;
+    select c.* from hs_office_contact c
+               where c.label = contactLabel
+               into relatedContact;
+
+    if relatedPerson.persontype = 'NATURAL' then
+        birthday := '1987-10-31'::date;
+    end if;
 
     raise notice 'creating test partner: %', idName;
     raise notice '- using person (%): %', relatedPerson.uuid, relatedPerson;
     raise notice '- using contact (%): %', relatedContact.uuid, relatedContact;
     insert
-        into hs_office_partner (uuid, personuuid, contactuuid)
-        values (uuid_generate_v4(), relatedPerson.uuid, relatedContact.uuid);
+        into hs_office_partner (uuid, personuuid, contactuuid, birthday)
+        values (uuid_generate_v4(), relatedPerson.uuid, relatedContact.uuid, birthDay);
 end; $$;
 --//
 
@@ -67,6 +76,7 @@ do language plpgsql $$
         call createHsOfficePartnerTestData('Second e.K.', 'second contact');
         call createHsOfficePartnerTestData('Third OHG', 'third contact');
         call createHsOfficePartnerTestData('Fourth e.G.', 'forth contact');
+        call createHsOfficePartnerTestData('Smith', 'fifth contact');
     end;
 $$;
 --//
diff --git a/src/test/java/net/hostsharing/hsadminng/hs/office/partner/HsOfficePartnerControllerAcceptanceTest.java b/src/test/java/net/hostsharing/hsadminng/hs/office/partner/HsOfficePartnerControllerAcceptanceTest.java
index d494b960..e0fe31a1 100644
--- a/src/test/java/net/hostsharing/hsadminng/hs/office/partner/HsOfficePartnerControllerAcceptanceTest.java
+++ b/src/test/java/net/hostsharing/hsadminng/hs/office/partner/HsOfficePartnerControllerAcceptanceTest.java
@@ -76,6 +76,11 @@ class HsOfficePartnerControllerAcceptanceTest {
                     .contentType("application/json")
                     .body("", lenientlyEquals("""
                     [
+                        {
+                            "person": { "familyName": "Smith" },
+                            "contact": { "label": "fifth contact" },
+                            "birthday": "1987-10-31"
+                        },
                         {
                             "person": { "tradeName": "First GmbH" },
                             "contact": { "label": "first contact" }